JP2002141188A - High pressure discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high pressure discharge lamp lighting device capable of shortening a rise time of a light output and preventing a glow discharge generated in starting a lamp. SOLUTION: This high pressure discharge lamp lighting device includes, at least, a high pressure discharge lamp 1 having a pair of electrodes 11 and 12 disposed opposite to each other in a discharge vessel, which is formed with sealing parts 14 and 15 in its both ends, and having 0.15 mg/mm3 or more of mercury sealed therein and a lamp feed circuit 2 provided for lighting the high pressure discharge lamp 1. This lighting device is characterized in that heaters 19, 20, and 21 heating and raising the outer surface temperature of a light emitting portion 13 of the discharge vessel to 100 deg.C or more before the starting the lighting of the high pressure discharge lamp 1 are provided and the power is fed from the lamp feed circuit 2 to the heaters 19, 20, and 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for a high-pressure discharge lamp, and more particularly to a lighting device for a high-pressure discharge lamp.
High-pressure discharge lamp lighting used for backlights of liquid crystal projectors and projection-type liquid crystal display devices using a high-pressure mercury lamp that contains mercury of at least ³ mm3 and has a mercury vapor pressure of over one hundred and several atmospheres when turned on. Related to the device.

[0002]

2. Description of the Related Art In general, a projection type liquid crystal display device is required to project an image uniformly on a rectangular screen with sufficient luminance, efficiency and color rendering. Therefore, a metal halide lamp in which mercury or a metal halide is sealed is used as a light source. In recent years, metal halide lamps have been required to be further miniaturized and made into a point light source, and lamps having an extremely small distance between electrodes have been put to practical use.

Recently, instead of metal halide lamps, high-pressure mercury lamps having a mercury vapor pressure of more than one hundred and several tens atmospheres at the time of lighting have been proposed. This is intended to further increase the light output by suppressing the spread of the arc by increasing the mercury vapor pressure at the start of lighting, that is, by narrowing down the arc. For example, Japanese Patent Application Laid-Open Nos.
Japanese Patent No. 52830 discloses such a technique.

[0004]

However, in order to achieve high luminance, high efficiency and high color rendering in the above-mentioned high-pressure mercury lamp, for example, a mercury vapor pressure of at least one hundred and several tens atmospheres is required. 0.15mg in the discharge vessel
/ Mm ³ or more of mercury must be enclosed. Therefore, when the high-pressure mercury lamp is started and turned on, it takes several minutes for the mercury accumulated in the liquid state on the inner surface of the arc tube to warm up to vapor, and to increase the vapor pressure to reach a predetermined light output. This phenomenon does not occur remarkably in conventional high-pressure mercury lamps whose mercury vapor pressure is not so high (for example, an internal pressure of 80 atm or less during operation) and low-pressure mercury lamps.

In general, a glow discharge is generated when the discharge lamp is started. At that time, a high cathode drop voltage causes tungsten as a cathode material to be scattered by sputtering, and the scattered tungsten adheres to the inner wall of the discharge vessel. This reduces the light output of the discharge lamp, which is an obstacle to extending the life of the short arc type mercury discharge lamp.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a high-pressure discharge lamp lighting device capable of shortening the rise time of light output and preventing glow discharge occurring at the time of starting the lamp. It is in.

[0007]

The present invention employs the following means in order to solve the above-mentioned problems.

[0008] The first means is that a pair of electrodes are disposed opposite to each other in a discharge vessel having sealing portions formed at both ends.
In a high-pressure discharge lamp lighting device including at least a high-pressure discharge lamp in which mercury of ³ mm or more is sealed, and a lamp power supply circuit provided for lighting the high-pressure discharge lamp, before starting the high-pressure discharge lamp, A heater for heating the outer surface temperature of the light emitting portion of the discharge vessel to 100 ° C. or higher is provided, and power is supplied to the heater from the lamp power supply circuit.

A second means is the first means, wherein the heater is wound around at least the sealing portion on the cathode side of the electrode, and one end of the wound heater is connected through the sealing portion. Opposite to the cathode, the other end of the heater is configured to be electrically connected to the cathode, and the high potential side of the heater voltage is applied to the other end of the heater when the heater is powered. It is characterized by.

A third means is that a pair of electrodes are disposed opposite to each other in a discharge vessel having sealing portions formed at both ends, and the discharge vessel has a sealing portion formed at both ends.
In a high-pressure discharge lamp lighting device including at least a high-pressure discharge lamp in which mercury of not less than ³ mm3 is sealed and a lamp power supply circuit provided for lighting the high-pressure discharge lamp, the high-pressure discharge lamp is started before the high-pressure discharge lamp is turned on. A heater power supply circuit of a heater capable of heating during lighting and heating the outer surface temperature of the light emitting portion of the discharge vessel to 100 ° C. or more is provided.

A fourth means is the third means, wherein the lamp power supply circuit and the heater power supply circuit are supplied with power from the same power supply, and the sum of output powers from both circuits does not exceed a specified value. An output power from the heater power supply circuit is controlled.

A fifth means is provided in any one of the first means to the fourth means, wherein a detecting means for detecting a temperature of the light emitting section is provided, and when the temperature reaches a specified value, Power supply to the heater is stopped.

In a sixth aspect, in any one of the first to fifth aspects, the heater is wound around the sealing portions provided at both ends of the discharge vessel, respectively. The wound heaters are connected along the light emitting portion, and a high voltage applied to the high-pressure discharge lamp at the time of starting lighting is applied between any one of the pair of electrodes and the heater. It is characterized by doing so.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram illustrating a configuration of a high-pressure discharge lamp lighting device according to the present embodiment. In the figure, 1 is a high-pressure discharge lamp such as a high-pressure mercury discharge lamp or a metal halide lamp, 2 is a lamp power supply circuit provided for lighting the high-pressure discharge lamp 1, and 3 is between the high-pressure discharge lamp 1 and the lamp power supply circuit 2. A starter (hereinafter, referred to as a starter) that generates a high voltage that causes dielectric breakdown between the electrodes of the high-pressure discharge lamp 1 is provided. The element (SW) 5 is a capacitor C4 provided to protect the switching element (SW) 4 from application of a surge voltage when the starter 3 of the high-voltage pulse method as in the present embodiment is used. , Choke coil L2
, And 6 is a DC power supply.

Here, a DC lighting type is used as the high-pressure discharge lamp 1, and the discharge vessel is made of quartz glass and has an elliptical spherical light emitting portion 13 forming a light emitting space.
And a rod-shaped cathode-side sealing portion 14 and an anode-side sealing portion 15 connected to each other so as to extend outward at both ends of the light-emitting portion 13.

In the light emitting section 13, a cathode 11 and an anode 12 are arranged opposite to each other with a distance between the electrodes being, for example, 2.0 mm or less on the tube axis of the discharge vessel.
Although not shown, the shaft portion extends into the cathode-side sealing portion 14 and is electrically connected to the external lead 17 via the cathode-side metal foil 16 airtightly embedded in the cathode-side sealing portion 14. Have been. Similarly to the anode 11, the anode 12 has a shaft portion extending into the anode-side sealing portion 15, and is electrically connected to the external lead 17 via the anode-side metal foil 18 airtightly embedded in the anode-side sealing portion 15. Connected.

In the light emitting section 13, mercury is sealed as a light emitting substance, and a rare gas such as argon or xenon is sealed as a lighting starting gas. The rare gas is, for example, 1.3
× 10 ⁴ Pa is enclosed. The amount of mercury is 0.15m
g / mm ³ or more, and the mercury vapor pressure during stable lighting becomes one hundred and several tens atmospheres or more.

Further, metal wires 19 and 20 as heaters are wound around the cathode side sealing portion 14 and the anode side sealing portion 15 so as to cover part or all of the sealing portions 14 and 15. And one end of the metal wire 20 is connected to a switch element (S
W) is connected to one end of a lead wire 22 connected to 4, the other end is connected to one end of a metal wire 19 via a metal wire 21, and the other end is connected to an external lead 17.

The lamp power supply circuit 2 is mainly composed of F
Switch element (Q1) using ET etc., diode (D
1), choke coil (L1), smoothing capacitor (C
1) A step-down chopper composed of a step-down or a high-pressure discharge lamp 1 for energizing a heater (metal wires 19, 20, 21).
Control output to The detection signals detected by the voltage detector V and the current detector I are input to the lamp control circuit,
When the heater is energized, the appropriate applied voltage, heater current, or heater power is set to the heater based on the detection signal, and when the heater is started or turned on, the appropriate lamp applied voltage, lamp current, A control signal is output from the lamp control circuit to a gate drive circuit provided to drive the switch element (Q1) so that the lamp power is supplied to the high-pressure discharge lamp 1.

Although not shown, the DC power supply 6 converts, for example, a voltage output from a diode bridge circuit or a voltage doubler rectifier circuit from a commercial frequency AC line into a P
It outputs a DC voltage smoothed by an active filter or the like having a harmonic current suppressing function called FC, and supplies it to the lamp power supply circuit 2.

Further, when the starter 3 is turned on,
The charging circuits R1 and C2 charged by the no-load open voltage supplied from the lamp power supply circuit 2 are switched by the switch element S1 when the charging voltage becomes equal to or higher than a predetermined voltage, generate a boosted oscillation voltage, and generate a boosted oscillation voltage via the diode D2. A transformer T1 for charging the capacitor C3, and when the voltage charged in the capacitor C3 exceeds a predetermined voltage, it is rapidly discharged through the gap G1 to generate a high voltage pulse of several kilovolts to several tens of kilovolts on the secondary side. Transformer T
2 etc.

Next, the operation of this high pressure discharge lamp lighting device at the time of starting lighting will be described with reference to FIG. When the high pressure discharge lamp 1 is started and turned on, when a lamp lighting signal is input to the lamp control circuit of the lamp power supply circuit 2, first, the switch element (SW) 4 is closed by a command from the lamp control circuit,
The heater can be energized. Switch element (S
W) 4 is closed, and a heater current is supplied from the lamp power supply circuit 2 to the metal wires 19 to 21 as heaters via the switch element (SW) 4 and the choke coil (L2). Here, the heater voltage, heater current, or heater power supplied to the heater is controlled by switching control of the switch element (Q1) based on detection signals detected by the voltage detector V and the current detector I in the lamp power supply circuit 2. Done. When the outer surface temperature of the light emitting portion 13 of the high-pressure discharge lamp 1 reaches a specified temperature by energizing the metal wires 19 to 21, the lamp control circuit instructs to open the switch element (SW) 4, and energizes the heater. Stop and end the heating of the discharge vessel. Here, the specified temperature depends on the amount of mercury enclosed and the volume of the light emitting part, but it is necessary to keep it at least 100 ° C. or higher.

After the power supply to the heater is stopped, the switch element (Q1) is controlled by a control signal from the lamp control circuit at the same time when the switch element (SW) 4 is opened, and the lamp power supply circuit 2 is required for starting and lighting. No-load open-circuit voltage is output. The starter 3 receives this no-load open-circuit voltage, starts up quickly, and generates a high voltage in the secondary winding of the transformer (T2). The high voltage is superimposed on the no-load open voltage and applied to the high-pressure discharge lamp 1, and the cathode 11 and the anode of the high-pressure discharge lamp 1 are combined with the fact that the discharge vessel of the high-pressure discharge lamp 1 has already been warmed to a high temperature. Between 12, the dielectric breakdown occurs immediately, the discharge according to the output of the lamp power supply circuit 2 is started, and the high-pressure discharge lamp 1 is turned on.

By arranging the metal wire 21 serving as a heater of the high-pressure discharge lamp 1 close to the vicinity of the light emitting portion 13, the no-load open-circuit voltage output from the lamp power supply circuit 2 is applied to the metal wire 21. Since it is applied through the filter circuit 4, it can function as a trigger wire,
It is possible to further contribute to speeding up of starting lighting.

As described above, according to the invention of this embodiment,
By increasing the outer surface temperature of the light emitting unit 13 to at least 100 ° C. before the start of lighting of the high-pressure discharge lamp 1, mercury existing in the discharge vessel can be evaporated in advance, and at the time of starting the lighting. The light output of the high-pressure discharge lamp 1 can be rapidly raised, and the occurrence of unwanted glow discharge, which tends to occur at the time of starting lighting, can be effectively prevented.

Further, in the present invention, a switch element (SW) 4 for limiting the current supply to the heater before the lamp is turned on is provided, and the power supply destination from the lamp power supply circuit 2 is set to the high pressure discharge lamp 1. Alternatively, since the operation is switched to the heater, there is no need to provide a special circuit device for heating the heater, and the cost can be reduced.

In this embodiment, the starter 3 uses a starter system for generating a high-voltage pulse.
A DC starter method in which the voltage gradually increases may be used.

The switching element (SW) 4 includes:
In addition to an electromagnetic relay and the like, a semiconductor switch element such as an FET may be used.

The current supply to the heater may be controlled by the lamp power supply circuit 2 so that the voltage applied to the heater becomes a specified value, or the current supplied to the heater is set to a specified value. May be controlled. Further, when there is a variation in the resistance value of the heater, the heater power may be controlled to a specified value in order to prevent the power supplied to the heater from being varied. At that time, in order to constantly control the heater power, the voltage detector V,
Since the detection signal from the current detector I is used, the lamp power control function when the lamp is turned on can be used as it is. Naturally, it is necessary to switch and set appropriate power target values for the heater power control and the lamp power control, respectively.

The timing for terminating the energization of the heater is determined by a thermocouple or radiation temperature (not shown) indicating that the outer surface temperature of the light emitting section 13 of the high-pressure discharge lamp 1 has reached a specified temperature, for example, 250 ° C. The determination may be made based on the time when a temperature detector such as a meter detects the temperature. Further, as the simplest method, a method of simply energizing for a fixed time is sufficiently practical. Furthermore, in that case, if the elapsed time from the previous lamp turning-off time is short, according to the elapsed time,
More advanced control can be performed, for example, by reducing the power supply time to the heater. This control is performed by the lamp power supply circuit 2
Is relatively complicated control, but can be easily realized by using a microprocessor.

If the heater burns out, the high pressure discharge lamp lighting device can easily detect that the heater current does not flow even when the heater voltage is applied to the heater. In such a case, the high-pressure discharge lamp 1 may be started immediately to save time.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram showing a configuration of the high pressure discharge lamp lighting device according to the present embodiment. In the figure, reference numeral 7 denotes a polarity inversion circuit for inverting the polarity of the voltage output from the lamp power supply circuit 2, and is configured by a switch element including a switch F1, a switch F2, a switch F3, and a switch F4. For example, a semiconductor switch element such as an FET is used. Other configurations are shown in FIG.
And the operation as a high-pressure discharge lamp lighting device is substantially the same as that of the first embodiment, so that the description is omitted.

Normally, in such a high-pressure discharge lamp 1, a cathode-side metal foil 16 is hermetically embedded in a cathode-side sealing portion 14, but when the lamp is turned on, the periphery of the cathode-side metal foil 16 is
Compared to the periphery of the anode-side metal foil 18, the cathode-side sealing portion 14
Alkali metal (for example, potassium) ions from the inside are likely to collect, and if these are accumulated for a long period of time, the airtightness around the cathode side metal foil 16 will be adversely affected and the pressure resistance of the lamp may be degraded.

In the high pressure discharge lamp lighting device of this embodiment, in order to solve the above-mentioned problem, when the heater is energized, the switch element (S
W) 4 is closed to energize the heater, and switches F1 and F3 of the polarity inversion circuit 7 are turned on;
By turning off the switches F2 and F4,
The heater current is caused to flow from the metal wire 19 to the metal wire 20. As a result, the base of the electrode of the cathode 11 is on the higher potential side of the voltage applied to the heater, but as shown in the figure, the potential of the point p1 of the metal wire 19 is connected to the external lead 17 so that the cathode 11 But the same potential as that of metal wire 1
The potential at the point p2 of No. 9 becomes lower than the potential of the point p1 due to a voltage drop between the point p1 and the point p2 of the metal wire 19. For this reason, the potential of the cathode 11 becomes higher than the point p2, and the cathode 11 can act in a direction in which alkali metal ions around the cathode-side metal foil 16 diverge, thereby preventing deterioration of the pressure resistance of the lamp.

After the power supply to the heater is completed, the switch element (SW) 4 is opened to stop the power supply to the heater in accordance with a command from the lamp power supply circuit 2, and the switches F4 and F2 of the polarity reversing circuit 7 are turned off. And switch F
By turning off the switch 1 and the switch F3, a no-load open-circuit voltage is applied from the lamp power supply circuit 2 to the starter 3 and the high-pressure discharge lamp 1 via the switches F4 and F2,
The high pressure discharge lamp 1 is turned on.

When the heater is energized by turning on the switches F1 and F3 and turning off the switches F2 and F4 as described above, the switch F1 is turned on during the lighting period of the high-pressure discharge lamp 1 thereafter. And switch F3
Is off and the switches F2 and F4 are on,
The technique described here can be applied to a case where so-called AC lighting is performed in which the switches F1 and F3 are turned on and the switches F2 and F4 are turned off alternately.

Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a diagram showing a configuration of the high pressure discharge lamp lighting device according to the present embodiment. In the figure, reference numeral 8 denotes a heater power supply circuit, and the high pressure discharge lamp lighting device of the present embodiment is different from that of the first embodiment in that a heater power supply circuit 8 is provided separately. Corresponds to the configuration of the same reference numeral shown in FIG.

When a lamp lighting signal is input, the heater power supply circuit 8 receives a signal from the heater control circuit 8 to control the D signal.
A switching element (Q2) for switching a DC voltage supplied from a C power supply 6 via a transformer (T3); a transformer (T3) for boosting a high-frequency voltage generated by switching of the switching element (Q2); Diodes D3 and D4 for rectifying and smoothing, smoothing capacitor C
4. It includes a heater current detector Ih for detecting a heater current, a heater voltage detector Vh for detecting a voltage applied to the heater, and the like.

In general, in a high-pressure discharge lamp, the mercury vaporization in the discharge vessel is incomplete immediately after the start of discharge, or the mercury vapor pressure is low due to the low temperature, and the brightness is not sufficient. This is because the internal impedance of the high-pressure discharge lamp is in a low state.In such a state, if sufficient power is to be supplied to the high-pressure discharge lamp, a large current must flow, resulting in a loss in the lamp power supply circuit. Inconveniences such as an increase in the size and an increase in the size of the element are required. For this reason, usually, the lamp power supply circuit is operated so as to limit the current to the upper limit allowed by the circuit, so that immediately after the start of discharge, sufficient power cannot be supplied to the high-pressure discharge lamp. As a result, the temperature inside the discharge vessel rises,
The internal impedance of the high-pressure discharge lamp rises, sufficient power can be supplied to the high-pressure discharge lamp, and it takes a long time to reach a predetermined light output.

However, in such a state, for example, in a liquid crystal projector, a projection type liquid crystal display device, and a projection type television, the increase in the brightness of the lamp becomes slow and the waiting time of the user increases. Is not preferred.

Therefore, in the high pressure mercury lamp lighting device according to the present embodiment, the lamp power supply circuit 2 and the heater power supply circuit 8 are provided independently, and can be operated independently and simultaneously. Even during the start-up lighting operation of the lamp 1, the heater can be energized to continue the temperature increase in the discharge vessel, and as a result, the mercury vapor pressure is rapidly increased, and the brightness of the high-pressure discharge lamp 1 is increased. Can be accelerated.

Further, in the high pressure mercury lamp lighting device of the present embodiment, the lamp power supply circuit 2 and the heater power supply circuit 8 are provided independently and can be operated independently. As will be described with reference to FIG. 6, various modes at the time of starting lighting are possible.

FIGS. 4A and 4B respectively show the lamp power supply circuit 2 in the high pressure discharge lamp lighting device shown in FIG.
FIG. 4 is a graph showing power characteristics of a lamp power Wp supplied to the high-pressure discharge lamp 1 from the heater and a heater power Wh supplied to the heater from the heater power supply circuit 8. Show the case.

In the high pressure discharge lamp lighting device according to the first embodiment, since the lamp power supply circuit 4 is shared as a power supply circuit for the heater, as shown by the power characteristic shown by the dotted line in FIG. Power supply to the heater is stopped. Therefore, the rise of the lamp power Wp becomes slow,
It can be seen that it takes a long time for the high-pressure discharge lamp 1 to reach a predetermined light output. On the other hand, in the high pressure discharge lamp lighting device of the present embodiment, power is supplied to the heater from the start lighting start time t0 to the time t1 as shown by the solid line in FIG. That is, by supplying the heater power Wh even during lamp lighting, the increase in the lamp power Wp can be accelerated, and the time required for the high-pressure discharge lamp 1 to reach a predetermined light output can be shortened.

FIGS. 5A and 5B respectively show the lamp power supply circuit 2 in the high pressure discharge lamp lighting device shown in FIG.
FIG. 4 is a graph showing power characteristics of a lamp power Wp supplied to the high-pressure discharge lamp 1 from the heater and a heater power Wh supplied to the heater from the heater power supply circuit 8. However, the case where the power supply to the heater is controlled in consideration of the power supply capability of the DC power supply 6 will be described.

As shown in FIG. 3, in this high-pressure mercury lamp lighting device, when the heater is energized even during lamp start-up and lighting, D and D are supplied to the lamp power supply circuit 2 and the heater power supply circuit 8.
Power must be supplied from the C power supply 6. For example,
When the rated power of the high-pressure discharge lamp 1 is 200 W and the rated power of the heater is 100 W, assuming that the efficiency of both the lamp power supply circuit 2 and the heater power supply circuit 8 is 90%, the DC power supply 6 An ability to supply a total of 333 W of electric power of 222 W and 111 W to the heater power supply circuit 8 is required. However, the period during which the heater needs to be energized is at most several minutes until the lamp brightness reaches a steady state. That is, it is not advisable to equip the lamp power supply circuit 2 with a power supply capacity of 222 W, but to provide a power supply capacity of 333 W for at most several minutes.

Therefore, in this high-pressure mercury lamp lighting device, the total power supplied to the lamp power supply circuit 2 and the heater power supply circuit 8 is set to, for example, 222 W as an upper limit, so that the total power supply from the heater power supply circuit 8 does not exceed this value. Heater power Wh
Is controlled, and as the lamp power p increases, the heater power W
h is reduced.

As described above, even when the power supply from the DC power supply 6 to the lamp power supply circuit 2 and the heater power supply circuit 8 is controlled, the initial power supply to the heater causes the heater power Wh of the rated power from the DC power supply 6 to be increased. Because of the input, the time until the brightness of the high-pressure discharge lamp 1 becomes a practical light output hardly changes, and the time until the final steady brightness is obtained is only slightly delayed. Rather, DC power supply 6
Since the power supply capability of the apparatus can be kept low, the size and weight of the apparatus can be reduced, and a great advantage of cost reduction can be obtained.

FIGS. 6A and 6B show the lamp power Wp supplied from the lamp power supply circuit to the high pressure discharge lamp and the heater supplied from the heater power supply circuit to the high pressure discharge lamp lighting device shown in FIG. FIG. 4 is a diagram illustrating power characteristics of the heater power Wh, in which power is supplied to the heater even when the high-pressure discharge lamp 1 is started and turned on, but the power supply to the heater is controlled in accordance with the lamp temperature.

In the high pressure discharge lamp lighting device according to the present embodiment, the heater is energized while measuring the temperature of the high pressure discharge lamp 1 since the original function of the heater is to increase the temperature of the lamp. When this is detected, the energization is stopped.

In the high pressure discharge lamp lighting device, when the high pressure discharge lamp 1 is started and lit from a state in which the high pressure discharge lamp is completely cooled, as shown by a power characteristic indicated by a solid line in FIG.
The energization of the heater is started to decrease at 2 and the energization of the heater is stopped at time t3. On the other hand, when the lamp is turned on again after a relatively short time after the high-pressure discharge lamp 1 has been turned off, as shown by the power characteristic indicated by the dotted line in FIG. At time t3 ', the power supply to the heater is stopped.

As described above, according to the invention of this embodiment,
When the high-pressure discharge lamp 1 starts operating from a state in which it is always completely cooled, the control is performed so as to supply a normal predetermined heater power. By reducing the power supply time to the heater or not supplying power to the heater at all, wasteful power consumption can be suppressed, and deterioration of the heater life due to fusing or oxidation due to excessive heating of the heater can be prevented. .

In the high pressure discharge lamp lighting apparatus according to the present embodiment, for example, the means for measuring the lamp temperature includes, for example,
A temperature sensor such as a thermocouple may be installed in the vicinity of the heater, or an infrared radiation thermometer may be installed so that the temperature in the vicinity of the heater can be detected. Conversely, a method of estimating the temperature from the measured value of the electric resistance of the heater using the property of increasing with the temperature rise may be used. In this case, the electrical resistance of the heater can be easily measured by measuring the values of the heater voltage and current using the heater current detector Ih and the heater voltage detector Vh of the heater power supply circuit 8.

As means for measuring the lamp temperature,
Instead of the means for calculating the electric resistance value and the temperature value by the above-described calculation processing, data related to the lamp temperature is obtained from the detected heater voltage and heater current, and the heater energization is stopped based on this data. May be determined, and the heater energization may be stopped indirectly based on information about the heater temperature.

As described above, the high-pressure mercury lamp lighting device according to the present embodiment is used in a liquid crystal projector, a projection type liquid crystal display device, and a projection type television as shown in the state of starting lighting in FIGS. In that case, the waiting time of the user can be reduced, and as a result, these excellent devices can be realized.

Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a diagram showing a configuration of the high pressure discharge lamp lighting device according to the present embodiment. In the figure, reference numeral 9 denotes a filter circuit for preventing the high voltage output from the starter 3 from being applied to the heater power supply circuit 2. Other configurations correspond to the configurations of the same reference numerals shown in FIG.

The high pressure discharge lamp lighting device of this embodiment is
Compared to the third embodiment, the high voltage output from the starter 3 is applied between the lead 17 on the cathode 11 side of the high-pressure discharge lamp 1 and the heater (metal wires 19 to 21), and the heater (metal The difference is that the filter circuit 9 is provided so that the high voltage applied to the lines 19 to 21) is not bypassed to the heater power supply circuit 8.

As shown in the figure, the high-pressure discharge lamp lighting device is configured such that at the time of starting lighting, a high voltage generated by the starter 3 is applied to metal wires 19 to 21 serving as heaters. Since the metal wires 19 and 20 are wound around the cathode-side sealing portion 14 and the anode-side sealing portion 15, respectively, and the metal wire 21 is disposed along the outer surface of the light emitting portion 13,
The high voltage is applied to the discharge space via the discharge vessel, and dielectric breakdown of the discharge space can be induced by a so-called dielectric barrier discharge.

In the high pressure discharge lamp lighting device of the present embodiment, after the start is completed, the lamp current of the high pressure discharge lamp 1 becomes
Since the secondary winding of the step-up transformer T2 of the starter 3 can be prevented from flowing, a thin secondary winding of the step-up transformer T2 of the starter 3 can be used.
The weight and size of the transformer T2 can be reduced.

Also, by providing the filter circuit 9, the high voltage from the starter 3 can be applied to the metal wires 19 to 2 of the heater.
1, which can be prevented from sneaking into the heater power supply circuit 8 and causing a malfunction or damage to the element.

Although not shown, the heater voltage is applied so that the cathode end of the metal wire 19 is directly connected to the cathode 11 and the cathode 11 is at a high potential only at the time of heating the heater during start-up lighting. Thus, as described above, the base of the electrode of the cathode 11 is set to a high potential with respect to the portion facing the metal wire 19, so that the pressure resistance of the high-pressure discharge lamp 1 can be prevented from deteriorating.

[0062]

According to the first aspect of the present invention, a heater is provided for heating the outer surface temperature of the light emitting portion of the discharge vessel to 100 ° C. or more before starting lighting, and power is supplied to the heater from the lamp power supply circuit. As a result, the mercury present in the discharge vessel can be evaporated in advance, the light output of the high-pressure discharge lamp at the time of starting the lighting can be rapidly increased, and undesired, which is likely to occur at the time of starting the lighting. Glow discharge can be effectively prevented from occurring. Further, since it is not necessary to provide a special circuit device for heating the heater, the cost can be reduced.

According to the second aspect of the present invention, the heater is wound around at least the sealing portion on the cathode side of the electrode, and one end of the wound heater faces the cathode via this sealing portion, The other end of the heater is configured to be electrically connected to the cathode, and the high potential side of the heater voltage is applied to the other end of the heater when the heater is supplied, so that the cathode has a higher potential than the one end of the heater. Therefore, deterioration of the pressure resistance of the lamp can be prevented.

According to the third aspect of the present invention, since the heater power supply circuit for heating the outer surface temperature of the light emitting portion of the discharge vessel to 100 ° C. or more before the start-up lighting and during the start-up lighting is provided, The heater power supply circuit can be operated independently and simultaneously.Even when the start-up lighting operation is in progress, the heater can be energized and the temperature inside the discharge vessel can continue to rise, rapidly increasing the mercury vapor pressure. As a result, the brightness of the high-pressure discharge lamp can be increased more quickly.

According to the fourth aspect of the present invention, the lamp power supply circuit and the heater power supply circuit are supplied with power from the same power supply.
Make sure that the sum of the output power from both circuits does not exceed the specified value.
Since the output power from the heater power supply circuit is controlled, the power supply capability from the power supply can be kept low.
The size and weight of the device can be reduced, and the cost can be reduced. Also, even if the power supply from the power supply is suppressed, the time required for the brightness of the high-pressure discharge lamp to become a practical light output is slightly increased, although the time required to reach the final steady brightness is slightly delayed. Can hardly change.

According to the fifth aspect of the present invention, the detecting means for detecting the temperature of the light emitting section is provided, and when the temperature reaches the specified value, the power supply to the heater is stopped. When starting the operation from a state where the lamp has been completely cooled, control is performed so as to supply a normal predetermined heater power, and when the lamp is turned on a relatively short time after being turned off, the heater is energized. The time is short or the power to the heater can be turned off at all, suppressing wasteful power consumption and preventing deterioration of heater life due to fusing or oxidation due to overheating of the heater. it can.

According to the sixth aspect of the present invention, the heaters are wound around the sealing portions provided at both ends of the discharge vessel, respectively, and the wound heaters are connected along the light emitting portion. Since the high voltage applied to the high-pressure discharge lamp at the time of starting lighting is applied between any one of the pair of electrodes and the heater, the high voltage generated by the starter at the time of starting lighting is the heater. Can be applied to the discharge space via the discharge vessel, and as a result, after start-up, it can be configured so that the lamp current does not flow to the output part of the starter.
The size can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a high pressure discharge lamp lighting device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a high pressure discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a high pressure discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 4 shows a high-pressure discharge lamp lighting device shown in FIG.
FIG. 4 is a diagram illustrating power characteristics of lamp power Wp supplied from the lamp power supply circuit 2 to the high-pressure discharge lamp 1 and heater power Wh supplied from the heater power supply circuit 8 to the heater.

FIG. 5 shows a high-pressure discharge lamp lighting device shown in FIG.
FIG. 7 is a diagram illustrating other power characteristics of lamp power Wp supplied from the lamp power supply circuit 2 to the high-pressure discharge lamp 1 and heater power Wh supplied from the heater power supply circuit 8 to the heater.

FIG. 6 shows a high-pressure discharge lamp lighting device shown in FIG.
FIG. 9 is a diagram illustrating other power characteristics of lamp power Wp supplied from the lamp power supply circuit to the high-pressure discharge lamp and heater power Wh supplied from the heater power supply circuit to the heater.

FIG. 7 is a diagram showing a configuration of a high pressure discharge lamp lighting device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-pressure discharge lamp 2 Lamp power supply circuit 3 Starter 4 Switching element (SW) 5 Filter circuit 6 DC power supply 7 Polarity inversion circuit 8 Heater power supply circuit 9 Filter circuit 11 Cathode 12 Anode 13 Light emitting part 14 Cathode sealing part 15 Anode side sealing Stop part 16 Cathode side metal foil 17 External lead 18 Anode side metal foil 19, 20, 21 Metal wire 22 Lead wire Q1 Switch element D1, D2, D3, D4 Diode L1, L2 Choke coil C1, C4 Smoothing capacitor C2, C3 Capacitor R1 Resistance T1, T2 Transformer G1 Gap F1 to F4 Switch element V Voltage detector I Current detector Vh Heater voltage detector Ih Heater current detector

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K072 AA12 AA13 AC20 BA03 BB01 CA16 DD06 DE02 DE04 GA02 GB18 GC04 HB03 3K082 AA09 BA05 BA24 BA25 BA43 BC14 BC23 BC29 BD03 BD04 BD23 CA32 FA03 5C039 AA08

Claims (6)

[Claims] 1. A high-pressure discharge lamp in which a pair of electrodes are opposed to a discharge vessel having sealing portions formed at both ends, mercury of 0.15 mg / mm ³ or more is sealed, and the high-pressure discharge lamp is turned on. A high-pressure discharge lamp lighting device including at least a lamp power supply circuit provided for before, before starting and lighting of the high-pressure discharge lamp, a heater for heating the light-emitting unit outer surface temperature of the discharge vessel to 100 ° C. or higher, A high-pressure discharge lamp lighting device, wherein power is supplied to the heater from the lamp power supply circuit. 2. The heater is wound around at least the sealing portion on the cathode side of the electrode, and one end of the wound heater faces the cathode via the sealing portion, and the other end of the heater is 2. The terminal according to claim 1, wherein the end is configured to be electrically connected to the cathode, and a high potential side of the heater voltage is applied to the other end of the heater when the heater is powered. High pressure discharge lamp lighting device. 3. A high-pressure discharge lamp in which a pair of electrodes are disposed opposite to each other in a discharge vessel having sealing portions formed at both ends, mercury of 0.15 mg / mm ³ or more is sealed, and the high-pressure discharge lamp is turned on. A high-pressure discharge lamp lighting device including at least a lamp power supply circuit provided for heating the high-pressure discharge lamp from before the start-up lighting to during the start-up lighting, wherein the temperature of the light-emitting unit outer surface temperature of the discharge vessel is 100 ° C. A high-pressure discharge lamp lighting device provided with a heater power supply circuit for a heater for heating as described above. 4. The lamp power supply circuit and the heater power supply circuit are supplied with power from the same power supply, and control the output power from the heater power supply circuit so that the sum of the output powers from the two circuits does not exceed a specified value. 4. The high pressure discharge lamp lighting device according to claim 3, wherein the lighting is performed. 5. A power supply system according to claim 1, further comprising detecting means for detecting a temperature of said light emitting section, wherein when said temperature reaches a specified value, power supply to said heater is stopped. The high-pressure discharge lamp lighting device according to claim 4. 6. The heater is wound around each of the sealing portions provided at both ends of the discharge vessel, and the wound heaters are connected along the light emitting portion, and at the time of starting lighting. The high voltage applied to the high-pressure discharge lamp is applied between any one of the pair of electrodes and the heater. Item 3. The high pressure discharge lamp lighting device according to item 1.